I'm an experimentalist physicist. The story line of my research is the manipulation of atoms by means of their interaction with lasers, with a preference for coherent process. Since few years, my main research is focused on the study of laser cooled large ion clouds, trapped in radio-frequency trap of different geometry. The TADOTI experiment, built for this study, is financially supported by the french national research agency (ANR). CNES (the french center for spacial research) is also involved due to the common points of TADOTI with micro-wave standard prototypes developed by JPL for the NASA.
Here is the picture of an ion cloud emitting laser induced fluorescence. It is made of several tens of thousands of calcium ions, laser cooled and trapped in a linear Paul trap. The elliptic shape is the signature of a correlated phase (liquid or crystal) whereas the layers which can be seen on the cloud demonstrate a local self-organization in a Coulomb crystal where the radio-frequency electric field is minimal, around the symmetry axis of the trap.
A coherent population trapping involving three (optical) photons identified in ions belonging to the same family as Calcium ions is demonstrated in a cloud of trapped Ca+. The dark line observed in the fluorescence of the cloud is referenced to a transition et 1.8 THz.
After more than 15 years of development, optical fiber links and optical frequency combs are now sufficiently mature to be spread and shared outside the time/frequency metrological institutes. The school follows on from the international development of optical fiber links and its objective is thus to broadcast among a wide community of physicist the possibilities of high precision measurement thanks to the optical fiber transfer of an optical frequency reference, coupled to a frequency comb.